The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 2009
Filed:
Mar. 10, 2004
Takeki Nogami, Takamatsu, JP;
Shigeya Yamaguchi, Takamatsu, JP;
Takeki Nogami, Takamatsu, JP;
Shigeya Yamaguchi, Takamatsu, JP;
Abstract
A diagnostic method and apparatus for diagnosing a motor-operated valve capable of continuously measuring a preload of a spring cartridge at low costs, with high accuracy, and with ease, so that the elastic characteristics of the spring cartridge may be easily calibrated in a simple manner. The method and apparatus is for diagnosing a motor-operated valve including a valve disca wormrotatably driven by motor power, a link mechanism which opens and closes the valve discwith the rotational driving force transmitted from the wormand a spring cartridgecontaining disc springswhich expand or compress in response to reaction force acting on the wormin its axial direction from the link mechanism. The method and apparatus calibrates the torque curve representing the elastic characteristics the spring cartridgebased on the load corresponding to a specific compression condition of the spring cartridgeand based on the torque curve thus calibrated, produces a diagnosis of the motor-operated valve. Accordingly, an easy and quick diagnosis can be achieved on whether the torque-related characteristics of the motor-operated valve are appropriate or not.